Here is the article I found:
We can now use the 93306, 93320, and 93325 together again. Here's a copy of the article on ACC's website:
Coding Alert: NCCI Corrects Echo "Add on" Codes
On April 1, 2009, the National Correct Coding Inititive (NCCI) removed its restriction on billing the echocardiography "add-on" codes (CPT 93320 and 93325) together. The NCCI accepted the ACC recommendation to retroactively remove the coding edit and permit medical providers to bill these codes with the appropriate echocardiography CPT code during the same visit on the same day.
+ 93320 - Doppler echocardiography, pulsed wave and/or continuous wave with spectral display (List separately in addition to code for echocardiographic imaging); complete
+ 93325 - Doppler echocardiography color flow velocity mapping (List separately in addition to code for echocardiographic imaging)
The College advises its members and office practices to resubmit any claims on or after Jan. 1, 2009 denied for using both CPT 93320 and 93350 together. For more information about coding changes for 2009, see The ACC 2009 Guide to Cardiology Coding and Payment Changes.